The quantity of electricity needed to reduce one centimole of dichromate in acid medium to chromic salt is

$C{r}_2{O}_7^{-2}+4H_{2}O+6e^{-}\to 2C{r}^{+3}+7H_{2}O$
For 1 mole $C{r}_2{O}_7^{-2}\to$  6 moles of electrons
For 1 mole of  $C{r}_2{O}_7^{-2}\to$6F requires
For 10^-2 moles of $C{r}_2{O}_7^{-2}\to ?$
$=\frac{{10}^{-2}\times 6}{1}=6\times {10}^{-2}F$
$6\times {10}^{-2}F=6\times {10}^{-2}\times 96500col=5790col$